Slow Cooker Apple Crisp

1 cup all-purpose flour

½ cup light brown sugar

½ cup white sugar

½ teaspoon ground cinnamon

¼ teaspoon ground nutmeg

1 pinch salt

½ cup butter, cut into pieces

1 cup chopped walnuts

⅓ cup white sugar, or to taste

1 tablespoon cornstarch

½ teaspoon ground ginger

½ teaspoon ground cinnamon

6 cups apples - peeled, cored and chopped

2 tablespoons lemon juice

Mix flour, brown sugar, 1/2 cup of white sugar, 1/2 teaspoon cinnamon, nutmeg, and salt together in a bowl. Combine butter with the flour mixture using fingers or a fork until coarse crumbs form. Stir in walnuts and set aside.

Whisk together 1/3 cup sugar, cornstarch, ginger, and 1/2 teaspoon cinnamon. Place the apples in a slow cooker, stir in the cornstarch mixture; toss with lemon juice. Sprinkle the walnut crumb topping on top. Cover and cook on High for 2 hours or Low for 4 hours, until apples are tender. Partially uncover the slow cooker to allow the topping to harden, about 1 hour.